Oil (Dry) - Crude oil with little or no water content.
Oil (Wet) - A mixture of crude oil and water which requires further processing to remove the water.

American Petroleum Institute (API) - The primary trade association representing all segments of the petroleum industry from exploration through marketing in the United States. API is the largest association in the petroleum industry and API provides a forum for the oil and natural gas industry to pursue public policy objectives and advance the interests of the industry

Crude Oil - An unrefined liquid petroleum consisting of a mixture of hydrocarbons. It ranges in gravity from 9 degrees API to 55 degrees API and in color from yellow to black. Crude oils may be referred to as heavy or light, according to API gravity, with lighter weight oil exhibiting the higher gravity. Viscosity varies with gravity; crude oils with lower gravity are more viscous and oils with higher gravity are less viscous.


Gravity (API) - The standard adopted by the American Petroleum Institute for measuring the density or gravity of liquid petroleum products on the North American Continent, derived from a specific gravity in accordance with the following equation:


API Gravity= 141.5

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Specific Gravity -131.5

A unit of measurement which describes oil characteristics related to viscosity and flow properties. In general, oil with a low gravity is heavier and more viscous than oil with a high gravity.